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4. Forward Speed Display
4.1 View Forward Speed
The forward speed is derived from a radar sensor fitted either to the Multi-Seeder or
the tractor, depending on your particular installation.
The speed is displayed in km/h only.
4.2 Minimum Speed Alarm
As part of product calibration, based on the resulting calibration factor, the instrument
automatically calculates the minimum forward speed below which the system cannot
maintain the programmed seed rate.
With the Multi-Seeder in work, if the forward speed goes below this threshold the
instrument display defaults to channel 1, flashes the actual speed and beeps
continuously. The alarm will continue until speed is increased above the threshold. It
may be cancelled temporarily by selecting another channel but will revert to channel 1
and repeat the alarm after 30 seconds until speed is increased.
NOTE: The application rate will not remain proportional below the minimum speed
threshold. The feed motor cannot run below 3 rpm, resulting in over-application.
4.3 Speed Sensor Calibration
The forward speed is derived from the speed sensor factor ("SSF") – the distance
travelled in millimetres for each pulse received from the radar speed sensor. The
default factor is 7.8mm per pulse from the sensor. This will only result in a correct
speed display if the sensor has been mounted at the correct angle to the ground.
Failure to programme the correct speed sensor factor will also result in the drilling rate
being displayed incorrectly. Auto-calibration is likely to be more accurate than manual
calibration and therefore it is recommended to perform an "Autocal" routine (see
overleaf).
HE-VA Auto-Controller AC-Lite - May 2016
Figure 6: Select Fwd. Speed
channel
13
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